W: GPG error: http://download.opensuse.org Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 85753AA5EEFEFDE9
W: GPG error: http://download.opensuse.org Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 51AFC9B27331E9C4 thx
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converted comment to answer The error you see is due to you having added a OpenSuse repository. Search in Dash for software sources and untick the OpenSuse repositories you see in the Other Software tab. Close and the refresh Update Manager Alternatively - from a terminal run
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